\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.5}

\begin{document}
\begin{tikzpicture}
%\tracingmacros=2 \tracingcommands=2
\begin{axis} [
	%axis equal,
	%disabledatascaling,
	xlabel=x,ylabel=y,zlabel=z,
	unit vector ratio=1 2 1,
%	ymin=-2000,ymax=2000,
%	zmin=-2000,ymax=2000,
%	scale=0.001,
	]
\addplot3 [surf, z buffer=sort, samples=15, variable=\u, variable y=\v, domain=0:180, y domain=0:360,
           colormap/cool] ({cos(u)*sin(v)}, {sin(u)*sin(v)}, {cos(v)});
\coordinate (bla) at (axis cs:0,0,0);
\addplot3[samples y=0,domain=-5:5] {0};
\end{axis}
\draw (bla) circle (60pt);
\end{tikzpicture}
\end{document}
